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New member from ireland
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TOPIC: New member from ireland

Re: New member from ireland 1 year, 3 months ago #5532

so rang HTM, he has a good condition head and cams on way from uk, said he been in discussion with a seller on eBay

asked me take head off too.

so off today, son is ill so while he is sleeping i went to the garage

head off, piston looks ok and not had much of a run so take it rich running to be expected

rings on piston were no lined up correctly, 2 runs were only about 1cm apart

piston pushed down so didn't get chance look at con rod

barrel has score arks but only one cane felt when run finger over it. not sure f its bad or not as any engine i taken apart never had any barrel marks

I also aid take clutch side cover off in hope finding my issues, 1st surprise was condition basket, like new not a single mark on it

but i did find the best news ever (well no good in reality) i found what looks be a plastic tooth

Once fins my impact gun ill take clutch basket off an hoping oil pump gear is damaged (its plastic and if its failed be cause off the problems)

plus they are know to fail on rare occasion















Re: New member from ireland 1 year, 3 months ago #5533

Yep that would do it, stripped oil pump gear

Re: New member from ireland 1 year, 3 months ago #5534

Quick shot of piston

Crank has no play what do ever



Re: New member from ireland 1 year, 3 months ago #5535

  • CJ
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I'm not a mechanic but would be getting the cylinder honed with that mark in it.

What's the concensus with piston ring alignment? I know Suzuki, and Honda manuals show the three sets of rings evenly spaced around the piston (ring gaps 120 degrees apart). Any mechanic I've even seen assembling an engine will always space the gaps 180 degrees apart and aligned so the gaps are always in line with the wrist/gudgeon pin. (Top ring one way, middle ring gap exact opposite side of piston, oil ring gap lined up with top ring)

Which alignment is correct?

Re: New member from ireland 1 year, 3 months ago #5536

  • CJ
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On second thoughts, if it was mine and $ weren't a concern I'd replace the piston and rings also while its apart. If you're on a tight budget and are happy to strip it again at some stage in the future if it starts burning oil then make do with what you have.

Re: New member from ireland 1 year, 3 months ago #5537

Plastic oil pump gear

Also screw on oil pump scrriipes when my bit snapped off.

Impact driver bit was heap junk it just bent when used it

New impact driver in car an will try heat it with soldering iron later

Doesnt work in kinda screwed





Re: New member from ireland 1 year, 3 months ago #5538

  • CJ
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Hard to tell just by looking at those photos but, to an amateur like myself, it looks like the piston has "picked up" on the cylinder either through overheating or lack of lubrication. The same thing may have happened to thr small end and/or big end bearings on your connecting rod. Like I said, I'm not a mechanic, but those score marks on the piston look more like sticking (caused by heat/running dry) rather than wear.

Re: New member from ireland 1 year, 3 months ago #5539

Markd are defo from lack oil

Reason beinh oil pump wasnt working. Luckily i caught it early

Thats my worry what about bottom end

As mate reminded me how do i know about any bikes unless buy new

Re: New member from ireland 1 year, 3 months ago #5540

Ran out while my son Ewan watches cartoons

2 hits with new driver out it came

Goes to show in some tools like this you get what you pay for

Re: New member from ireland 1 year, 3 months ago #5541

  • CJ
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john_aero wrote:


As mate reminded me how do i know about any bikes unless buy new

Very true! How do I know my bike isn't the same or worse...I don't.

As for the Phillips head screw, if all else fails, you could try drilling the head off, taking off everything so you have whatever is left of the bolt stem protruding, then try heating/cooling that somehow and grabbing it with a small pipe wrench. If that fails then you in the shit and will probably need to drill the bolt out and have the female part of the thread helicoiled. If you go down the path of drilling the head of the bolt out, use a small bit a tiny bit bigger than the bolt diameter. Do it a bit at a time so you don't damage any of the housings, just take enough metal off so the head of the bolt falls off.

But I suggest you seek qualified advice before deciding you want to do anything I've suggested....I'm a farmer not a mechanic.

Re: New member from ireland 1 year, 3 months ago #5544

I got it out, i just bought a new impact driver. Old one was junk

If didnt work id looked welding bolt on 1st, then drilling if that failed

Oil pump looked very good, but there is a slight roughy feel when turned counterclockwise

I have got all bits off and checked

Next is wait for answer and parts from shop

Issues i have are as you mentioned, bottom end bearings, hoe bad are they or any damage

And what caused plastic pump fail that wont happen again

Re: New member from ireland 1 year, 2 months ago #5553

  • Bala
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The cam cap in one of the early picks shouted oil supply problem.

For peace of mind and reliability it needs the big end bearing doing as well and while it was that far apart then all other bearings.

looks like they are a nikasil bore so the cylinder needs replate or replace.

Many years ago I started using what was in a kawasaki book for ring spacing.

Top ring gap at rear, second ring gap at front, oil ring gap at rear.

I have done a lot of engines this way and never had a problem.

Re: New member from ireland 1 year, 2 months ago #5554

Bala wrote:
The cam cap in one of the early picks shouted oil supply problem.

For peace of mind and reliability it needs the big end bearing doing as well and while it was that far apart then all other bearings.

looks like they are a nikasil bore so the cylinder needs replate or replace.

Many years ago I started using what was in a kawasaki book for ring spacing.

Top ring gap at rear, second ring gap at front, oil ring gap at rear.

I have done a lot of engines this way and never had a problem.


What do you mean about the cam cap?

Yes im in limbo about botton end. Looks like caught in time but hard tell

I have not worked on bottom end before so i dont have the tools and not sure shop will cover the cost

Re: New member from ireland 1 year, 2 months ago #5555

As for the barrel im getting one free out if a used enginr so if in good nick ill use it

Head he sending me one from same engine

Re: New member from ireland 1 year, 2 months ago #5556

  • Bala
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This is what I called the cam cap, its generally the first place that suffers from oil starvation.



Big end rebuilds require a decent press a dial gauge and a few other bits and pieces.
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